I'm starting some freelance work w/ my HVX200, and some of the firms I've been talking to about videography are looking for two-man teams - a video guy with his own gear, and an audio guy with his own gear.

I've been talking to a friend of mine who just graduated with his Master's in Music Theory (and a BA in electronic music production) who said he's interested in going as an audio tech, but needs to know what equipment to buy.

He's got an iBook and mixers right now, so what else might he need? I'm figuring some Sennheiser wireless mics, a shotgun/super shotgun, and a boom for starters, but is there anything else he might need to throw in on to get properly started?

You will need a portable mixer, I use the Sound Devices 302 - 3 channels and XLR outs. Of course, I run it to a professional full size camera, but I've used it with a DVX, which should work nicely with your HVX.